Improvement in botary pumps



@uitrit l tutes atrnt ffice.

destra il TALrnY, or soMnuviLLE, ASSIGNOR To HIMSELF AND MELLEN i i intimos BOSTON, MASSACHUSETTS.

ffy, Letarslatemlvo. 75,811, (wat Maronti, ists.

IMPROVElVlEhll IN ROTARY PUMPS.

'ro wHoM 1T MAY eoNoEuN: i

Be it known that LJOSEPH A. 'lL-ihrer, of Somerville, in the county of Middlesex, and State of Massachusetts, have invented certain new and useful Improvements in Rotary Pumps; and I hereby declare the followl ing 'to be a full, clear, and exact-.description ofpthc same, reference being` had to the accompanying drawings,

in which-- Figure 1 is aside elevation of a pump constructed in accordance with my invention, the side of the pumpi case being removed so as to show the arrangement of the interior mechanism.

Figure 2'is a longitudinal vertical section through the centre of the pump. 'p Figure 3 represents a modified form o the cam or eccentric for operating the piston-ring.

In rotary pumps, of ordinary construction, the combination and arrangement of the pistons and other necessary operative parts, are such as tounavoidably subject such parts to excessive and continuous friction during-.1 the time the pump is in operation. The eiiect of this continuous attrition is to destroy in a comparatively short 'time the efficacy of the working parts of the pump, the wear and tear upon them being such as to require their frequent repair andl renewal, which notonly is productive of much delay, but gives rise to an expenditureof labor and money, which, were the pump otherwise constructed, might easily be avoided.

The object of my Vinvention is to produce a pump in which the operative. parts, while arranged to obtain the best results, shall be both simply constructed, and disposed within the pump-case so as to almost entirely avoid all friction, especially between the piston andthe pump-case, where it is productiveof the greatest disadvantages. i

To enable those skilled inthe art to understand and use my invention, I will now proceed to describe the manner in which the same is or may he carried into effect by reference to'the drawings accompanying and forming part of' this specification.

The pump-case A is provided ywitha cylindrical compartment, a, for the reception of the piston, and with admission and discharge-pipes or orifices, b c. Within the cylinder a is a shaft, d, the ends of which are mounted centrally in the ends oi' the cylinder, so that the shaft shall revolve upon the axis yof the cylinder. ,One end-of,

the shaft projects from the case, and has mounted upon it a crank or pulley, to which power may be applied from some suitable motor so asjto-causovthe revolution of the shaft. A diska-c, is mounted eccentrically upon the shaft d, the two being cast in one piece, it' desired, and around this disk tits a pistonring,f. The latter is placed loosely upon the disk, being entirely disconnected therewith, and is so arranged that that portion of it furthest removed from -the shaft d', or, in other words, the axis of the cylinder, shall be in contact with the con tiguous portion of thesurface of the cylinder. v

When the shaft d revolves, the cam or-disk c moves with it, and carries' around the piston-ringf, which thusl gradually passes over the surface of the cylinder. If the disk and piston-ringI were rigidly connected, it will readily be secu Vthat the latte-il 'would be dragged aroundover the interior surface of the cylinder, the same portion of the piston being in contact with the cylinder at all times, thus inducing a friction, which would cause the piston as well as the cylinder to become rapidly worn away and uniitted for use. This defect, however, is

entirely obviated by the arrangement'oi' parts shown in the drawings. As' the piston-,ring is mounted loosely `upon the disk,fand is free to revolve uponits own axis, the resistance which is induced by contact between `the cylinder and itself, as it moves in its circular-path, following the interior surface of the cylinder, will cause it` to rotate uponits own axis, thus enabling it to roll around the cylinder, and consequently to wholly prevent any lattrition between the portions of the cylinder and vpiston which comein contact.` The pistonf, when being operated, has thus two' motions, the one being its eccentric movement around theaxis a: ofthe cylinder, the other its rotary movement upon its ownaxis y.

In order .te avoid friction between the disk c and piston-ring f, I mount frictionrolls g, in the former, at thcpoints where the pressure of the disk upon the piston is greatest.

In g. 8, I have showna modified form of the cam for actuating the piston, consisting. of a' frame of cast iron or other suitable material, 72, rigidly secured to the shaft d, and carrying friction-rolls, whose relative posi4 tion tothe surrounding piston-ring is the same as shown in the other figures. Other modificationsl of this inechan ism will readily,suggest'themselves to those skilled in the art to which this invention pertains.Y

The pump-cylinder is provided with but one opening, k, through which the water or other fluid is loth admitted from the pipe 6 and discharged into the pipe c. In this opening there moves a'bent arm, Z. which.

carries upon its free end a valve, m. The other cud of the arm is hinged to the pu1np-case at n, as shown in the drawings. That part of the arm which extends up through the opening k, is curved, forming the are of a circle', the centre of which is the point n, or thereabouts, so as to admit of the free play of the arm and the valve m. The valve is shaped so-aszto itclosely to the piston f, and is hinged to the arm Z, as shown in the drawings, so that it may adapt itself to the movement of the piston. It is needless to say that both the piston f, arm Z, and valve m, fit tightly againstthc ends' of thc pump-case, a suitable packing being employed for this purpose, if necessary. Under this arrangement it 4will be seen that the arm and its valves divide the opening in the cylinder a into two passagcs-thc one, r, through which'the water passesfrom the indnction-pipe I) into the cylinder, the other, s, through which the water is discharged from the cylinder into the eduction-pipe c.

The pressure of the water within the pump willalways suice lto hold the valvcm at all times against the piston, so as to close all direct communication between the two passages rs, but, if desired, a spring,p, or other suitable means, may be employed toaid in effecting this result. i

' The operation of. the pump is as follows: Let it be supposed the piston is in the position covering the opening c, shown in red lines in fig. 1. I-f now the'shaf't d'be revolved in the direction indicatediby the arrow, the piston will be gradually moved around the cylinder a, opening the passage r, through which the water will be drawn, as indicated by the arrows, into the cylinder.- As the piston moves aroundthe cylinder, thc water will continue to be drawn in until one revolution has been completed, in which case the whole of the upper portion of the cylinder vwill be filled with the liquid; New, as soon as the piston begins its second revolution, the passage a is opened, through which'theA water, by theaction of the piston, is forced into and through the discharge-pipe e in a. continuous stream. At the same time a fresh l'supply of the liquidis being drawn in again through the passage r, to be in its'turn discharged through the passage s.' In order to more cfcctually close all communication between the two chambers into which the pump is divided by the piston and arm and valve, a packing of leather or other suitable material may bc applied to the inner surface of the cylinder and to the valve m.

-Having now described my invention, and the manner in which the same is or may be carried into effect, what I claim, and desire to secure by Letters Patent, is

1. The combination, with the cylinder of a rotary pump, of the eccentric-piston ring, its actuatingam or eccentric, and the valve'andv valve-arm, for regulating the admission and discharge of the fluid into and from v the said cylinder, in the manner and for the purposes herein'shown and set forth.

2. The combination, withthe pump-cylinder and eccentric-piston ring,` of the valve and armf'or holding the same in position, and the orifices or pipes for the induction and eduction of the fluid, arranged and operating substantially as herein shown and described.

3. The construction and arrangement, within the pumpcase and-cylinder, of the hinged vulve and valvearm, substantially as shown and described. I

In testimony whereof, I'have signed my name to this specification before two subscribing witnesses.

JOSEPH A. TALPEY.

Witnessesa i IsArAn KNowLss, Jr., JAS. B. BELL. 

